Battery Processing Method and Battery Processing System

The present application claims priority to Japanese Patent Application 2024-179302, filed Oct. 11, 2024, the entire contents of which are incorporated herein by reference.

Embodiments relate to a battery processing method and a battery processing system.

In recent years, lithium-ion batteries have been widely used as in-vehicle batteries of electric-powered vehicles such as electric vehicles and hybrid vehicles. The lithium-ion battery contains valuable substances including lithium. It is requested to recycle valuable substances from the used lithium-ion batteries for resource circulation.

Patent Literature 1 discloses a method for increasing an amount of lithium contained in a positive electrode material by discharging the used lithium-ion battery to collect lithium from the positive electrode material.

[Patent Literature 1] JP-A-2022-049831

The positive electrode material is generally configured by forming a positive electrode active material on a current collector foil such as aluminum. For example, in a case of a ternary system (NMC), the positive electrode active materials include the valuable substances such as nickel, manganese, and cobalt. In order to collect the valuable substances from the positive electrode active material, the positive electrode material is roasted together with a reducing agent and pulverized, and then a black mass or the like containing the positive electrode active material is selected. Next, the black mass is subjected to stepwise solvent extraction to sequentially extract manganese, cobalt, and nickel, and finally lithium is extracted. Thus, it takes time and effort to collect lithium in particular.

One or more embodiments may provide a battery processing method and a battery processing system capable of efficiently collecting lithium from a lithium-ion battery.

a battery processing method for processing a lithium-ion battery including a positive electrode material and a negative electrode material, the battery processing method including: a first step of charging the lithium-ion battery while cooling to deposit lithium on the negative electrode material; a second step of returning a temperature of the lithium-ion battery to a room temperature; and a third step of charging the lithium-ion battery while cooling again to deposit lithium on the negative electrode material. One or more embodiments may provide

According to an embodiment, lithium can be efficiently collected from a negative electrode of the lithium-ion battery.

The present inventors have conducted intensive studies to efficiently collect lithium from a lithium-ion battery, and have found that lithium can be efficiently collected from the lithium-ion battery by intentionally generating lithium deposition (for example, dendrite), which is not desirable in a normal charging reaction, on a negative electrode material. Based on this finding, the present inventors have completed a battery processing method capable of efficiently collecting lithium from the lithium-ion battery.

a battery processing method for processing a lithium-ion battery including a positive electrode material and a negative electrode material, the battery processing method including: a first step of charging the lithium-ion battery while cooling it to deposit lithium on the negative electrode material; a second step of returning the lithium-ion battery to a room temperature; and a third step of charging the lithium-ion battery while cooling it again to deposit lithium on the negative electrode material. A method for reusing a lithium-ion battery according to an embodiment is

1 FIG. 1 FIG. 200 1 200 10 1 20 1 Hereinafter, a reuse system of a lithium-ion battery according to a first embodiment will be described with reference to the accompanying drawings.is a block diagram schematically illustrating a reuse systemof a lithium-ion battery. As illustrated in, the reuse systemincludes: a reuse unitsecondarily using the lithium-ion batterythat has been used primarily in an electric-powered vehicle, for example; and a recycle unitcollecting lithium from the lithium-ion batterythat has been used secondarily.

10 1 1 10 The reuse unitreuses the lithium-ion battery, which has been used primarily, as an electrical storage device. In general, a deteriorated state of the lithium-ion battery for the electric-powered vehicle is determined on the basis of state of health (SOH) that indicates, for example, how much capacity is available in comparison with a new battery when the battery is fully charged. When it is determined that the lithium-ion batteryis inappropriate for use in the electric-powered vehicle on the basis of a degree of the deterioration, it is removed from the vehicle, and is used in the reuse unitas the electrical storage device for any of various secondary applications, such as a storage of renewable energy including solar power and wind power and a backup power source in the event of a disaster. For example, when the SOH becomes 70% or less, it may be determined that it is inappropriate for the primary use, that is, for use in the electric-powered vehicle.

10 1 12 201 12 1 1 12 1 The reuse unitincludes the lithium-ion battery, which is used secondarily as the electrical storage device, a charging device, and a cooling/temperature increasing device. The charging devicecan charge the lithium-ion batteryin any appropriate charging pattern by adjusting voltage and current. For example, the lithium-ion batterycan be charged continuously with a predetermined voltage and a predetermined current, and can also be charged intermittently with the predetermined voltage and the predetermined current (also referred to as pulse charging). An upper limit of a charging voltage by the charging deviceis a withstand voltage of the lithium-ion batteryor less, and is 4.3 V or less, for example.

20 21 1 31 35 1 22 35 23 The recycle unitincludes: a disassembly devicethat disassembles the lithium-ion batteryinto a positive electrode material, a negative electrode material, and the like through a lithium deposition step described below when it is determined that the lithium-ion batterycan be inappropriate for secondary use on the basis of the SOH, for example; an extraction devicethat extracts lithium from the negative electrode materialafter the disassembly; and a collection devicethat collects extracted lithium. For example, when the SOH becomes 40% or less, it may be determined that it can be inappropriate for the secondary use.

2 FIG. 1 1 4 4 4 3 schematically illustrates the lithium-ion batterythat is mounted on the electric-powered vehicle. The lithium-ion batteryconstitutes a battery pack having battery modules, each of which incorporates functions as a charge/discharge circuit and a cooling mechanism. Furthermore, the plural battery modulesare connected to each other and accommodated in a case. Each of the battery modulesis formed by connecting plural battery cellsin series or in parallel with each other, and is adjusted to desired capacity and a desired voltage.

1 The lithium-ion batteryis a rechargeable lithium-ion secondary battery. In the present specification, the term “lithium-ion battery” may collectively refer to the battery cell, the battery module, and the battery pack unless otherwise specified.

3 FIG. 3 FIG. 3 3 3 38 31 34 35 40 38 is a cross-sectional view schematically illustrating the battery cell. As illustrated in, the battery cellaccording to the present embodiment is of a laminated type. The battery cellincludes: a laminated electrode bodyin which the positive electrode material, a separator, and the negative electrode materialare laminated in this order in a lamination direction A; and a casethat accommodates the laminated electrode body.

38 31 34 35 3 In the present embodiment, the laminated electrode bodyis formed by laminating plural sets of the positive electrode material, the separator, and the negative electrode materialin the lamination direction A. The battery cellhas a rectangular shape that is thin and long in a width direction B when viewed in the lamination direction A.

31 32 33 32 34 32 32 32 33 32 33 a 3 FIG. The positive electrode materialincludes a positive electrode current collectorand a positive electrode active materialthat is disposed on a surface of the positive electrode current collectorfacing the separator. In a positive electrode current collector end portion, the plural positive electrode current collectorsare connected to each other at one end (a left side in) in the width direction B that is orthogonal to the lamination direction A. A metal foil suitable for a positive electrode can be suitably used for each of the positive electrode current collectors. A material that is used as a positive electrode active material of a lithium-ion secondary battery can be used as the positive electrode active material. In the present embodiment, each of the positive electrode current collectorsis made of aluminum, and the positive electrode active materialis made of NMC (nickel, manganese, and cobalt).

35 36 37 36 34 36 36 36 37 36 37 a 3 FIG. The negative electrode materialincludes a negative electrode current collectorand a negative electrode active materialthat is disposed on a surface of the negative electrode current collectorfacing the separator. In a negative electrode current collector end portion, the plural negative electrode current collectorsare connected to each other at the other end (a right side in) in the width direction B. A metal foil suitable for a negative electrode can be suitably used for each of the negative electrode current collectors. A material that is used as a negative electrode active material of the lithium-ion secondary battery can be used for the negative electrode active material. In the present embodiment, each of the negative electrode current collectorsis made of copper, and the negative electrode active materialis a carbon material (graphite) that has a layer structure.

33 37 39 39 39 6 The positive electrode active materialand the negative electrode active materialeach contain an electrolytic solution. The electrolytic solutionis, for example, an organic solvent in which lithium ions can move. In the present embodiment, the electrolytic solutioncontains dimethyl carbonate (DMC), ethylene carbonate (EC), and diethyl carbonate (DEC) in a volume ratio of 1:1:1, and contains lithium hexafluoride phosphate (LiPF) at a concentration of 1 mol/L.

34 31 35 34 34 The separatoris disposed between the positive electrode materialand the negative electrode material, and physically and electrically separates them from each other. The separatormay be a porous body having plural minute pores through which the lithium ions can pass. In the present embodiment, the separatoris a porous film that is made of polyolefin.

40 41 42 38 41 42 41 41 41 41 42 42 42 42 41 a b a a b The casehas a first caseand a second casethat are provided as a pair on both sides in the lamination direction A of the laminated electrode body. The first caseand the second caseare each formed to have a hat-shaped cross section. The first caseincludes: a pair of flange portionslocated at both ends in the width direction B; and a body portionthat is located between the paired flange portionsand bulges in a direction away from the second casein the lamination direction A. Similarly, the second caseincludes a pair of flange portionsand a body portionthat bulges in a direction away from the first case.

41 42 32 36 41 42 40 38 40 32 36 41 42 38 41 42 40 38 41 42 43 41 42 3 a a a a a a a a b b b b a a The first caseand the second caseare joined to each other in a state of sandwiching the positive electrode current collector end portionand the negative electrode current collector end portionbetween the flange portions,, and thereby constitute the case. That is, in a state where the laminated electrode bodyis accommodated in the case, the positive electrode current collector end portionand the negative electrode current collector end portionare sandwiched between the paired flange portions,, and a remaining portion of the laminated electrode bodyis accommodated in a space that is defined between the paired body portions,. In the state of being accommodated in the case, the laminated electrode bodyis crimped with a predetermined pressure in the lamination direction A by the paired body portions,. An example of a tabaccording to an embodiment is formed by a portion, which is sandwiched by the paired flange portions,, in the battery cell.

1 1 1 1 1 1 10 4 FIG. 4 FIG. Next, reuse of the lithium-ion batterywill be described.is a flowchart schematically illustrating a flow of reuse of the lithium-ion battery. As illustrated in, when it is determined that the lithium-ion battery, which is mounted on the electric-powered vehicle, is in the deteriorated state that is not suitable for use in the electric-powered vehicle on the basis of the SOH, for example, a reuse step (step S) is executed. In the reuse step S, the lithium-ion batteryis removed from the electric-powered vehicle and used secondarily in the reuse unit.

1 2 10 2 1 35 2 1 35 a first step of charging the lithium-ion batterywhile cooling to deposit lithium on the negative electrode material; 1 a second step of increasing a temperature of the lithium-ion battery; and 1 35 a third step of charging the lithium-ion batterywhile cooling again to deposit lithium on the negative electrode material. In a case where it is determined that the lithium-ion batteryis in a predetermined deteriorated state after being used secondarily as the electrical storage device, a lithium deposition step (step S) is executed following the secondary use in the reuse unit. In the lithium deposition step S, the lithium-ion batteryis charged to deposit lithium on the negative electrode material. The lithium deposition step Sincludes:

5 FIG. 5 FIG. 5 FIG. 5 FIG. 5 FIG. 201 3 201 3 201 3 202 3 202 3 3 202 202 3 3 3 202 3 202 35 a b c is a view schematically illustrating the cooling/temperature increasing device.also schematically illustrates the battery cellthat is cooled or whose temperature is increased by the cooling/temperature increasing device. As illustrated in, a pair of the cooling/temperature increasing devicesis provided on both sides of the battery cellin the lamination direction A. In addition, it may be configured that, in one of the paired cooling/temperature increasing devices, a single cooler/temperature increasing element covers the entire battery cellin the width direction B, or, as illustrated in, it may be configured to provide plural sets of cooler/temperature increasing element pairsthat are divided in the width direction B of the battery cell. In the present embodiment, a central cooler/temperature increasing element pairA for cooling a central portionof the battery celland cooler/temperature increasing element pairsB,C for respectively cooling both side portions,of the battery cellare provided. The number of the cooler/temperature increasing element pairsmay be three, or may be divided into two, four, or more. For example, when the battery cellis cooled only by the central cooler/temperature increasing element pairA, lithium is preferentially or selectively deposited in the negative electrode materialthat is located in a central portion in the width direction B. In an implementation, the cooler/temperature increasing element may be in the form of the pair, or may be disposed only on one side (an upper side or a lower side in) in the lamination direction A, for example.

201 201 201 The cooling/temperature increasing devicemay be a cooling/temperature increasing device of any appropriate type. For example, a thermostatic bath may be adopted as the cooling/temperature increasing device. In addition, the cooling/temperature increasing devicemay be a device that includes a cooling device and a temperature increasing device as separate devices. Alternatively, for example, cooling may be performed in the thermostatic bath, and the temperature may be increased in an oven.

1 201 35 1 6 FIG. 6 FIG. In a first step, the lithium-ion batteryis charged while being cooled by the cooling/temperature increasing deviceunder a predetermined cooling condition. Here, a graph inillustrates a relationship between a charging rate with respect to state of charge (SOC) and ease of deposition of lithium at each temperature. More specifically, when charging is performed in a region above a curve at each temperature, the deposition of lithium is facilitated on the negative electrode material. The SOC is an index indicating a charged state of the battery, and indicates battery capacity at the time when a fully charged state is set as 100% and a completely discharged state is set as 0%. As illustrated in, lithium is more likely to be generated as the SOC of the lithium-ion batteryis increased and/or as the temperature thereof is reduced.

1 35 Thus, in the first step, the lithium-ion batteryis charged at the charging rate and a cooling temperature, at which lithium is deposited on the negative electrode material.

1 1 1 The cooling temperature varies by a use environment, a type, and the like of the lithium-ion battery. However, when the lithium-ion batteryis of a so-called capacitive type (also referred to as an energy type) that is mounted on an electric vehicle, it can be 20° C. or less, 10° C. or less, 0° C. or less, −5° C. or less, −10° C. or less, −20° C. or less, or −30° C. or less, and can be −50° C. or more, −40° C. or more, −30° C. or more, −25° C. or more, or −20° C. or more. From a viewpoint of reliably depositing lithium on the cooled portion, the temperature may be −10° C. or less. In addition, in order to prevent the deposition of lithium on the entire lithium-ion batterydue to excessive cooling, the cooling temperature may be −50° C. or more or −40° C. or more. In one aspect, the cooling temperature can be from −40° C. to 10° C.

A cooling rate during cooling may be 0.1° C./min to 10° C./min, for example. From a viewpoint of unevenly distributing deposition positions of lithium, the cooling rate may be 1° C./min to 10° C./min. In the present disclosure, the “cooling rate” and a “temperature increasing rate” are parameters that are based not on a temperature of a surrounding environment but on a temperature inside the battery.

1 Thus, in the first step, the lithium-ion batteryis charged while being cooled.

35 As a result, lithium can be deposited on a part of the negative electrode materialwithout high-rate charging, and a charging current can be suppressed. Thus, energy can be saved.

2 1 1 201 1 12 201 12 201 Here, in the lithium deposition step S, the lithium-ion batteryonly needs to be charged in the cooled state. Cooling of the lithium-ion batteryby the cooling/temperature increasing deviceand charging of the lithium-ion batteryby the charging devicemay be started simultaneously, or one thereof may be started first. That is, after being cooled by the cooling/temperature increasing device, it may be charged by the charging devicewhile maintaining a cooled state by the cooling/temperature increasing device.

1 Meanwhile, in the first step, in a case where charging, which is performed while only a part of the lithium-ion batteryis cooled, is not the high-rate charging, there is a possibility that the deposition of lithium in the cooled portion is suppressed due to progress of a normal charging reaction in a non-cooled portion. Thus, charging may be performed by the high-rate charging.

35 In the present specification, the high-rate charging means charging with a large current that intentionally generates lithium in the negative electrode materialduring charging.

1 1 35 For example, when the lithium-ion batteryis of the capacitive type, it may be charged with the current of 2 C or more, for example. Meanwhile, when the lithium-ion batteryis of a so-called high-output type (also referred to as a power type) that is mounted on a hybrid vehicle, it may be charged with a current of 10 C or greater, for example. Here, the current of 1 C means a current that is required to fully charge each of the lithium-ion batteries in one hour. Lithium can be deposited further efficiently on the negative electrode materialby the continuous high-rate charging for a predetermined time.

1 1 In the present specification, the lithium-ion batterybeing of the capacitive type means a case where the energy density thereof is 600 Wh/L or greater. In addition, the lithium-ion batterybeing of the high-output type means a case where the output density (kW/kg or kW/L) is 4000 kW/L or more.

39 1 1 When the charging current in the high-rate charging becomes excessively large, unfavorable side reactions, such as gasification of the electrolytic solutionand deformation and damage of each component, possibly occur due to heat generation. Thus, from a viewpoint of energy saving, excessive charging current is not preferable. For example, when the lithium-ion batteryis of the capacitive type, an upper limit of the charging current may be set to about 3 C. Meanwhile, when the lithium-ion batteryis of the high-output type, the upper limit of the charging current may be set to about 20 C.

201 1 35 37 35 39 37 37 Next, in the second step, the cooling/temperature increasing deviceincreases the temperature of the lithium-ion batteryto a predetermined temperature. Lithium that has been deposited on the negative electrode materialin the first step is ionized by the temperature increase and then absorbed by the negative electrode active material(for example, graphite) in the negative electrode material. At this time, since the temperature increase is accompanied by a reduction in viscosity of the electrolytic solutionand an increase in mobility of lithium ions, lithium ions are preferentially absorbed into a portion with high lithium ion absorption capacity in the negative electrode active material. Thus, a part of the negative electrode active materialafter completion of the second step can be in a state of absorbing a larger amount of lithium ions than that before the first step.

1 In the second step, the temperature may be increased to a room temperature. In the present specification, the term “room temperature” refers to a temperature within a range of 5° C. to 35° C. Accordingly, in the second step, the temperature of the lithium-ion batterycan be increased to 5° C. to 35° C., e.g., may be to 15° C. to 25° C.

1 In the second step, the temperature may be increased by leaving the lithium-ion batteryin a room temperature environment for a predetermined time, or the temperature may be increased by heating. A heating method may be a suitable method, e.g., a hot water bath or an oven.

The temperature increasing rate during heating may be 0.1° C./min to 20° C./min, for example. From a viewpoint of unevenly distributing deposition positions of lithium lastly, the temperature increasing rate may be 1° C./min to 10° C./min.

1 1 In addition, in the second step, discharge may be performed, e.g., the lithium-ion batterymay be discharged, while the temperature is increased. By discharging while increasing the temperature, it is possible to improve efficiency of charging in the subsequent third step. At this time, the discharge may be performed at the same rate as the rate at which charging is performed in the first step, for example. Furthermore, the discharge is not only performed while the temperature is increased. For example, in the second step, the temperature may be increased after the discharge is performed first, or the discharge may be performed after the temperature is increased. From a viewpoint of generating a normal discharge reaction in the lithium-ion battery, the discharge may be performed while the temperature is increased or after the temperature is increased.

1 35 Next, in the third step, the lithium-ion batteryis charged while being cooled again to deposit lithium on the negative electrode material.

37 A charging condition and a cooling condition in the third step may be any of the conditions listed in the first step. Alternatively, the charging condition and the cooling condition in the third step may be different conditions from those in the first step depending on the battery deteriorated state, a lithium ion absorption state of the negative electrode active material, and the like. For example, in the third step, from a viewpoint of depositing a larger amount of lithium than that in the first step, the cooling temperature may be 1° C., 2° C., 3° C., 5° C., 7° C., or 10° C. less than that in the first step.

37 37 35 35 A part of the negative electrode active material, which has absorbed the large amount of lithium upon completion of the second step, is cooled in the third step. Thus, upon completion of the third step, a lithium deposition amount in the part of the negative electrode active materialcan be larger than the lithium deposition amount upon completion of the first step. Thus, in the first to third steps described above, lithium can be deposited on the entire negative electrode materialin a state where the lithium deposition amount in the part of the negative electrode materialis larger than that in the other portions.

1 10 3 21 1 31 34 35 40 35 21 1 1 21 Next, the lithium-ion batteryis removed from the reuse unit, and a battery disassembly step (step S) is executed by the disassembly device. In the battery disassembly step, the lithium-ion batteryis disassembled into components such as the positive electrode material, the separator, the negative electrode material, and the case. When only lithium is intended to be collected, at least the negative electrode materialmay only be disassembled. The disassembly devicemay be any appropriate device that automatically disassembles the lithium-ion battery. Here, the lithium-ion batterymay be disassembled manually by using a tool or the like without using the disassembly device.

4 35 35 36 37 35 Next, a lithium extraction step (step S) is executed to extract lithium from the disassembled negative electrode material. In the lithium extraction step, after the negative electrode materialis exuded with water and then filtered, the negative electrode current collectorand the negative electrode active materialare removed from the negative electrode material, and an aqueous solution containing lithium ions is thereby extracted.

35 2 4 In addition, in the disassembled negative electrode material, the portion having the larger lithium deposition amount than the other portions in the third step or fourth step of the lithium deposition step Sis selectively subjected to the lithium extraction step S. In this way, lithium can be efficiently extracted.

5 Finally, a lithium collection step (step S)is executed to collect lithium from the aqueous solution containing lithium ions. In the lithium collection step, after lithium is subjected to a solution treatment with carbonated water and then filtered, lithium is collected as lithium carbonate.

35 31 31 35 As a result, since the negative electrode materialis generally formed by laminating graphite on the current collector foil, such as copper, in the form of the layer, it contains less types of valuable substances than the positive electrode materialthat has plural types of the valuable substances such as cobalt, nickel, and manganese. Accordingly, unlike a case where lithium is collected from the positive electrode material, stepwise solvent extraction of plural types of the valuable metals does not require time and effort. Thus, lithium can be efficiently collected from the negative electrode material.

1 1 2 1 2 1 4 3 In the first embodiment described above, the description has been made on the case where, after the lithium-ion batteryis subjected to the reuse step Sin the form of the battery pack, the lithium deposition step Sis executed. In the reuse step Sand/or the lithium deposition step S, the lithium-ion batterymay be subjected in the form of the battery moduleor the battery cell.

12 2 12 2 The second embodiment differs in that a second lithium deposition step Sis employed instead of the lithium deposition step Saccording to the first embodiment. The second lithium deposition step Sincludes from the first step to the third step as in the lithium deposition step S, and further includes a fourth step that is repeated or performed at least once. In the fourth step, after the third step, the temperature of the lithium-ion battery is increased to the room temperature, and it is then again charged while being cooled to deposit lithium on the negative electrode material.

In the fourth step, the temperature increase, cooling, and charging may be performed under the same conditions as those listed in the first to third steps. In addition, similar to the second step, the discharge may be performed while the temperature is increased. Furthermore, in regard to the temperature increase, the discharge may be performed during the temperature increase as in the second step or before/after the temperature increase.

35 37 10 In the fourth step, the temperature increase, cooling, and charging are each performed at least once. From a viewpoint of depositing the larger amount of lithium on the negative electrode materialupon completion of the fourth step, the number of repetitions of a set of the temperature increase, cooling, and charging may be two or more times, three or more times, five or more times, seven or more times, eight or more times, or ten or more times, and may be three or more times. In addition, as the number of the repetitions of the temperature increase, cooling, and charging is increased, the amount of lithium ions that can be absorbed by the negative electrode active materialduring the temperature increase converges to a constant value. Thus, the excessive number of repetitions leads to energy loss. Accordingly, the number of the repetitions may be 30 times or less, 25 times or less, 20 times or less, 15 times or less, 10 times or less, or 8 times or less, and may betimes or less.

37 37 37 35 Due to the temperature increase during the fourth step, lithium that has been ionized again is absorbed in a region (active region), where lithium ion absorption capacity still remains, in the negative electrode active material. By repeating the deposition of lithium in subsequent cooling and charging and the absorption of lithium ions in the active region of the negative electrode active materialby the further temperature increase, an absorption amount of lithium ions in the entire negative electrode active materialconverges to a constant upper limit value. Accordingly, by repeating the temperature increase, cooling, and charging in the fourth step for the suitable number of times, the larger amount of lithium can be deposited on the negative electrode materialthan that in a case of executing up to the third step.

12 1 3 1 1 12 1 4 201 4 In the second embodiment, the description has been made on, as the example, the case where the second lithium deposition step Sis executed after the lithium-ion batteryis provided in the form of the battery cellin the reuse step S. In the reuse step Sand/or the second lithium deposition step S, the lithium-ion batterymay be provided in the form of the battery pack or the battery module. In this case, the cooling/temperature increasing devicemay be built in the battery pack or the battery modulein advance.

200 1 The reuse systemof the lithium-ion batteryaccording to the present disclosure may correspond to the configuration described in the above embodiment, or various modifications can be made thereto.

In the above embodiment, the description has been made on the example in which the lithium-ion battery is of the laminated type. In an implementation, a lithium-ion battery in a cylindrical shape or a polygonal shape may be adopted, which is formed by winding a belt-shaped laminated electrode body, in which a belt-shaped positive electrode material, a belt-shaped separator, and a belt-shaped negative electrode material are laminated in the lamination direction A, in a cylindrical shape or a square shape. In a case of the cylindrical shape or the polygonal shape, the lamination direction corresponds to a radial direction orthogonal to a winding direction.

Although the description has been made on a cell-by-cell basis, it may be implemented on a module-by-module basis or on a battery pack-by-battery pack basis. In a case of the implementation on the battery pack-by-battery pack basis, the pressing device, the cooling device, and the like may be provided in the battery pack in advance.

200 1 According to the reuse systemof the lithium-ion batteryaccording to an embodiment, the following aspects are provided.

the first step of charging the lithium-ion battery while cooling to deposit lithium on the negative electrode material; the second step of increasing the temperature of the lithium-ion battery; and the third step of charging the lithium-ion battery while cooling again to deposit lithium on the negative electrode material. The battery processing method for processing the lithium-ion battery including the positive electrode material and the negative electrode material, the battery processing method including:

in the first step and/or the third step, cooling is performed at a rate of 0.1° C./min to 10° C./min. The battery processing method according to the first aspect in which

in the second step, the temperature is increased by heating. The battery processing method according to the first or second aspect in which

in the second step, the temperature is increased at a rate of 0.1° C./min to 20° C./min. The battery processing method according to the third aspect in which

in the second step, discharge is performed while the temperature is increased. The battery processing method according to any one of the first to fourth aspects in which

in the first step and/or the third step, charging is performed by high-rate charging. The battery processing method according to any one of the first to fifth aspects in which

the fourth step repeated at least once, in the fourth step, after the third step, the temperature of the lithium-ion battery being increased to the predetermined temperature, and it being then charged while being cooled to deposit lithium on the negative electrode material. The battery processing method according to any one of the first to sixth aspects further including:

the battery disassembly step of disassembling at least the negative electrode material from the lithium-ion battery; and the lithium extraction step of extracting lithium from the negative electrode material. The battery processing method according to any one of the first to seventh aspects further including:

in the lithium extraction step, lithium is selectively extracted from a specific portion of the negative electrode material. The battery processing method according to the eighth aspect in which

the cooling device capable of cooling the lithium-ion battery and capable of controlling a cooled state and a non-cooled state; and the charging device that charges the battery. A battery processing system for processing the lithium-ion battery including the positive electrode material and the negative electrode material, the battery processing system including:

the temperature increasing device capable of increasing a temperature of the lithium-ion battery. The battery processing system according to the tenth aspect further including:

1 : lithium-ion battery 3 : battery cell 4 : battery module 10 : reuse unit 12 : charging device 20 : recycle unit 21 : disassembly device 22 : extraction device 23 : collection device 31 : positive electrode material 34 : separator 35 : negative electrode material 38 : laminated electrode body 39 : electrolytic solution 40 : case 200 : reuse system 201 : cooling/temperature increasing device